Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Ex 8.2, 2 Choose the correct option and justify your choice : (i) (2 tan⁑〖30Β°γ€—)/(1 + π‘‘π‘Žπ‘›2 30Β°) = sin 60Β° (B) cos 60Β° (C) tan 60Β° (D) sin 30Β° We know that , tan "30Β°" = 𝟏/βˆšπŸ‘ So, (𝟐 π’•π’‚π’β‘γ€–πŸ‘πŸŽΒ°γ€—)/(𝟏 + π’•π’‚π’πŸ πŸ‘πŸŽΒ°) = (𝟐 Γ— (𝟏/βˆšπŸ‘))/(𝟏 + (𝟏/βˆšπŸ‘)^𝟐 ) = (2/√3)/(1 + 1/3) = (2/√3)/(4/3) = 𝟐/βˆšπŸ‘Γ—πŸ‘/πŸ’ = 2/√3Γ—(√3 Γ— √3)/4 = βˆšπŸ‘/𝟐 Options are (A) sin 60Β° (B) cos 60Β° (C) tan 60Β° (D) sin 30Β° Since, sin "60Β°" = βˆšπŸ‘/𝟐 So, the correct answer is (a)

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.